【中文版】

多头交易是一种投资策略，通常用于在股市中获得盈利。在多头交易中，投资者预测某个股票的价格将上涨，因此他们购买该股票的看涨期权或签订购买合同，以期在股票价格上涨时卖出获利。

多头交易的核心在于投资者通过购买看涨期权或签订购买合同，获得了购买股票的权利。如果股票价格上涨到预期的水平，投资者就可以通过卖出这些期权或合同来获得利润。因此，多头交易的风险相对较小，因为投资者只需要支付一定的费用就可以获得这种权利。

然而，如果股票价格没有上涨，投资者可能会面临一定的损失。因此，在进行多头交易时，投资者需要进行充分的市场调研和风险评估，以确保他们的投资决策是正确的。

【英文版】

Long trading is an investment strategy commonly used to obtain profits in the stock market. In long trading, investors predict that the price of a stock will rise, so they buy call options on the stock or enter into a purchase contract, with a view to selling at a profit when the stock price rises.

The core of long trading lies in the fact that investors have acquired the right to buy stocks by purchasing call options or entering into purchase contracts. If the stock price rises to the expected level, investors can make profits by selling these options or contracts. Therefore, long trading has relatively small risks because investors only need to pay a certain fee to obtain this right.

However, if the stock price does not rise, investors may face certain losses. Therefore, when conducting long trading, investors need to conduct sufficient market research and risk assessment to ensure that their investment decisions are correct.